TWI295625B - A manufacturing process and product of foam material for the application of microwave absorption - Google Patents

Description

1295625 _ IX. OBJECT DESCRIPTION OF THE INVENTION · Technical Field of the Invention The present invention relates to a method and a finished product for manufacturing a microwave absorbing foamed material, and more particularly to a method for blending foam with polyene as a main material. The agent, the microwave absorbing material (such as conductive carbon black) and other additives are kneaded, and after being continuously extruded by the extruder, electron beam irradiation (Electron Beam Radiation) is used for bridging, and then the foaming process is often performed to generate microwave absorption foaming. In the above manufacturing process, the foaming agent is cleaved by electron beam irradiation and foaming process to produce gas, and the pulling and smelting plastic is staggered in all directions, so that most sealed bubbles are formed in the structure. The hole has the characteristics of weather resistance, durability and water resistance. [Prior Art] According to the characteristics of light absorption, high cushioning, electromagnetic wave absorption and interference shielding, the microwave absorption foaming material is widely used in EMI shielding, protection and defense military industries, and its use efficiency can avoid electronic components. The interference during operation can also shield the influence of electromagnetic waves in the environment on the human body. In order to reduce the weight and ease of construction of the carrier, the finished product will be subjected to the molding process of the foaming technology, and then the microwave absorbing material is impregnated to form the finished microwave-absorbing foam material. In general, the conventional microwave absorbing foamed material is manufactured by the manufacturing method as shown in the first figure, and is a predetermined ratio of the polymerized polyol, diisocyanate, water, catalyst, foam stabilizer, and other additives. The raw materials are mixed and foamed under high-speed agitation to obtain an open-celled polyurethane (PU) foamed material (that is, a foamed material is first produced), and then the foamed material is impregnated into a uniformly dispersed conductive carbon black solution. So that the conductive carbon black is adsorbed on the 1295625 open cell wall Jl, and the microwave absorption work (four) microwave absorption foam material is completed. As far as the manufacture and use of the conventional polyurethane (pu) microwave absorbing foaming material is concerned, the financial loss is unexpectedly the biggest loss, because the filament is made of foamed material, and then the έ/fork conductive carbon black solution is used. Forming, it is easy to have hydrolysis degradation and conductive carbon black drop phenomenon, in addition to the physical properties, the falling particles also affect the human body. Moreover, the finished PU microwave absorbing foamed product may be used in the short-day stagnation (within about five years) due to the falling or weathering of the carbon black particles, so that it must be replaced and discarded. The advancement of the abandoned PU# material has become a serious burden on the environment. Further, the conventional PU microwave absorbing foamed material which is currently used in the market is not used outdoors because the water absorbing property of the open-cell foam is sponge (must be shielded). Therefore, it is known that the conventional microwave-absorbing foamed materials have poor weather resistance, longevity, and water repellency, which are required to be frequently replaced, and the discarded PU hair lining also causes a problem in handling and environmental protection. Poor products, and products to be developed for new processes, to improve. SUMMARY OF THE INVENTION The main purpose of the present invention is to provide a method and a finished product for the microwave absorbing foaming material, which can be used for the microwave absorbing material of the conductive carbon black and the foaming enamel during the manufacturing process. The material scale, and the _ sub-wire bridge and the foaming agent cracking gas are recorded, so that the microwave Wei can be completely incorporated into the formed foam structure and form a sealed cell, which can have excellent weather resistance. Microwave absorption for sex, durability and water resistance. 1295625 The finished product of the microwave absorbing foaming material of the invention is made of polyolefin plastic as the main basic material, and the microwave absorbing material (such as conductive carbon black) mixed with the foaming agent and other additives are mixed and kneaded, and then continuously pressed by the extruder to be applied. The electron beam is irradiated to the bridge, and then the foaming process is often heated to generate a microwave absorbing foamed product, and the structure has a surface layer and an inner layer; the inner layer of the foamed material is bridged and foamed by electron beam irradiation. The blowing agent cleaves to produce a gas, and the drawn molten plastic is staggered in all directions to form a multi-sealed cell. The manufacturing method of the microwave absorbing foaming material of the invention is subjected to the following manufacturing process: (1) mixing the main basic materials of the polyolefin plastic, mixing the foaming agent, the microwave absorbing material and other additives; (2) feeding the extruder Continuously extruding into a sheet-like body; (3) subjecting the sheet-like body to electron beam irradiation to bridge; (4) sending a person to heat the foaming furnace to foam, and the finished product of the microwave-absorbing foaming material is produced through the above-mentioned manufacturing process. In the above manufacturing method and the finished towel, the bridging density can be adjusted by adjusting the electron beam _ dose. In the above production method and finished product, many of the cells generated in the foamed material are sealed cells, and have excellent weather resistance and water repellency. [Embodiment] In order to achieve the above object, the present invention will be fully described by the following detailed description of the preferred embodiments and the accompanying drawings. The present invention is a finished product of the (10) wave absorbing foaming material, so that a suitable plastic is basically selected for molding. The present invention is to select an environmentally friendly polythene hydrocarbon plastic as a main basic material. 1295625 For the manufacturing process of the embodiment of the present invention, please refer to the second figure, the polyolefin plastic blending foaming agent, the conductive carbon black and other additives are kneaded, and then continuously extruded into a sheet by an extruder, and then delivered. The bridge is designed to increase the strength, and the cross-linking bridge is selected by electron beam irradiation technology. The electron beam is output by the electron accelerator system (the different electron beam irradiation dose can be adjusted to adjust the bridge density), and then the sheet material It is sent to a continuous heating furnace to crack the foaming agent in the material to produce a nitrogen gas, thereby forming a three-dimensional expansion foaming, and then cooling to form a microwave-absorbing foamed product. The finished product of the microwave absorbing foaming material of the embodiment of the present invention, as shown in the third figure, is a sheet-like foaming material having a pre-edge edge type and a thickness, and the conductive carbon black material has been fiber-reinforced during the manufacturing process of the present invention. Since the scale (4), the hybrid electric bridge and the foaming process, the conductive carbon black material component is evenly distributed in the structure of the foam material, and the microwave absorption function can be obtained. The finished foamed material is divided into a surface layer n and an inner layer 12' on the structure _. When viewed and enlarged, as shown in the fourth figure, there are a plurality of cells 13 in the inner layer 12, and the cells are The 13 series is enhanced by the electron beam riding bridge of the 3 pieces in the tablet of the extruder, and the gas is generated by the foaming agent after the foaming agent is cracked, and the plastic is pulled and stretched in all directions. Sealed cells, and thus the conductive carbon black material components can be (4) and stably distributed in the foam material, Wei Jiazhi, durability and water resistance, developed in the room for light use; The microwave absorption effect of each part should be uniform, and there will be no unevenness. Therefore, the microwave absorption effect of the whole 1295625 foam material should be consistent. The invention has been researched and developed on the needle needle, that is, the 胄 riding_hydrocarbon microwave absorbing foam material, and the surface resistance values required for the microwave suction (four) foam material can be obtained by the touch. Reference recipes, trial records and test records are listed below. 1. The reference formulation of the polyolefin microwave absorbing foaming material of the present invention is as follows: Raw material LDPE foaming agent zinc oxide antioxidant Carbon Black percentage 10 〜90 0-30 0~10 0~10 0-30 LDPE: density range 〇 · 91 〇 · 92 (g/cm3) ASTM D-792 Melt n〇w index 0·2~10 (g/10min) ASTM D-1238 DSC melting peak 106-113 (〇C) Rate 10°C/min Softening point 88~100(°C) ASTM D-1525 Foaming agent·· ADCA (Azodicarbonamide, azomethine, yellow powder) True specific gravity 1.2~2. 裂解 Cracking temperature 180~220(°C) Average grain Diameter 2·0~25(//) Oxidation: Zinc Oxide, white powder or yellow-white powder, melting point 270~300 (°C) Specific gravity 5.0~6.0 Purity 90~100 (%) Antioxidant: White powder melting point 100 ～120 (°C)

Carbon Black : Conductive carbon black

Pore vo1ume (DBP-absorption) 100-500 (ml/100g) ASTM D-2414-79

Surface area (BET/%) 500~1000(m2/g)ASTM D-3027-78 Apparent bulk density 100~500(kg/cm3)ASTM D-1512-79 A295625 Extruder setting reference temperature: 100~130 °c Reference dose of electron beam irradiation: 2~10 Mrad Heating foaming furnace setting reference conditions: 180~240 t 2. The repeated research of the present invention is carried out, and examples are as follows [Example 1··Microwave Absorbing Foaming Material] 1· Formula and percentage

Raw material name specification 851AS 6334F i Percentage 92.5 5.8 — ^^3

ZnO AO-1010 0.1 0.1 Melt Index 9 g/10Min, specific gravity 1.014) 6334F (Former-plastic company, polyethylene resin) AC-2F-K3 (Japan EIWA company, foaming agent, azodiamine) ZnO (Sui An Company , oxidation word) AO-1010 (high silver company, antioxidant) 2 · continuous extrusion machine master film extrusion

Temperature setting: 110~120 °C 3. Electron beam irradiation dose 6. 0 Mrad 4·heating foaming furnace temperature setting: 220 °C 5. Test physical surface resistance value (Ω/per square) Using equipment calibration unit 200~ 300 Mitsubishi Chemical Laresta-EP MCP-T360 Taiwan Electronic Inspection Center 1295625

The microwave absorption spectrum is as follows: imioys.sm

[Example 2: Microwave Absorbing Foaming Material] 1. Formulation and Percentage Raw Material Name Specification 851AS 6334F AC-2F-K3 ZnO A0-1010 Percentage 86 9.8 4 0.1 0.1 851AS (Maokang Company, polyethylene as substrate conductive carbon black grain , Melt Index

9 g/10Min, specific gravity 1.014) 6334F (Former-plastic company, polyethylene resin) AC-2F-K3 (Japan EIWA company, foaming agent, azodiamine) ZnO (Shenan company, zinc oxide) A0- 1010 (High Silver Company, Antioxidant) 2. Continuous Extruder Master Extrusion

Temperature setting: 116~126 °C 3. Electron beam irradiation dose 5. 6 Mrad 1295625 4·heating foaming furnace temperature setting: 228 °C 5. Test physical surface resistance value (Ω/per square) Use equipment calibration unit 600 ~800 Mitsubishi Chemical Laresta-EP MCP-T360 The Taiwan Electronic Inspection Center has a microwave absorption spectrum as follows:

688(0)2.0ΗΗ

[Example 3: Fabrication of Microwave Absorbing Foam Material] As Example 2, a mixture of a carbon nanotube (5%) and a polyethylene was used instead of polyethylene as a substrate conductive carbon black particle. [Example 4··Microwave Absorbing Foaming Material] As in the third embodiment, a mixture of flaky iron oxide (10%) and polyethylene was used instead of polyethylene as the substrate conductive carbon black particles. 1295625 . [Example 5: Fabrication of Microwave Absorbing Foam Material] As Example 4, a mixture of flake alumina (10%) and polyethylene was used instead of polyethylene as the substrate conductive carbon black particles. Third, the microwave absorption foaming material financial test test items include: (1) salt spray environmental test, (2) high humidity environmental test, (3) low temperature environmental test, (4) high temperature environmental test, etc., test procedure reference • MIL-STD_810F standard. Without the environmental test sample cell structure as shown in the third figure, there was no significant change in the appearance of the sample after salt spray, high humidity, low temperature and high temperature tests. The cell structure of the sample after the test is as shown in the fourth figure. It can be seen from the above description that the present invention generates bridging by electron beam irradiation in the process of manufacturing the microwave absorbing foaming material, and then pulls the molten plastic in the process of converting into nitrogen gas by cleavage of the azo-type blowing agent in the heating furnace. Staggering and stretching in all directions, and finally achieving a uniform expansion and expansion of the plastic and uniformly distributing the conductive carbon black in the structure of the foamed material, and completing the predetermined size and various surface resistance values required; The microwave absorbing material added is not limited to the material of the conductive carbon black, but other materials such as carbon nanotubes, flaky iron oxide or flaky oxides, etc. can be added as microwave absorbing materials. The microwave suction-collecting material of the present invention can be produced. And this - the manufacturing method and the achieved empty __ 攸 microwave absorption of the lining 'when the thought or system is suppressed, this (four) through the silk scan test, the end of the control can be controlled and finished 'and confirmed its surface The electric_uniformity and stability are better than those of the conventional polyurethane-impregnated conductive carbon black solution. 12 1295625 (The surface resistance value and the conductivity type carbon black are absolutely in the resin content and the thickness of the finished foam material. The related 'production of the type of material can be refined wire © Ί resistance value), so the invention patent application is requested. 'Please apply for the patent as soon as possible, and the company will be listed on the market. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is not a block diagram of the manufacturing method of the embodiment of the present invention. The second figure is not the side view of the finished product of the embodiment of the present invention. Figure 5 is a cross-sectional view and a magnified view of the finished product of the present invention. Figure 5 is a diagram showing the cell structure of the sample of the present invention after environmental testing. [Main component symbol description] 11 - one surface layer 12 - inner layer 13 - - cell 13

Claims (1)

1295625 X. Patent application scope: • 丨· A method for manufacturing microwave absorbing foam material, which is subjected to the following manufacturing process: - (1) The main basic materials of polyolefin plastic, blending foaming agent, microwave absorbing material and others (1) The material after the mixing is sent to the extruder to be continuously extruded into a sheet-like body; (3) the sheet-like body is irradiated by electron beam irradiation; (4) being sent to a normal-pressure heating foaming furnace for foaming; Through the above manufacturing method, a finished microwave absorbing foam material can be produced. 2. The method of producing a microwave absorbing foamed material according to claim 1, wherein the electron beam of the illuminating bridge is output by an electron accelerator system. 3. The method of producing a microwave absorbing foamed material according to claim 1 or 2, wherein the electron beam irradiation system adjusts different doses to adjust the bridging density. 4. The method of producing a microwave absorbing foamed material according to claim 1, wherein the added microwave absorbing material may be a conductive carbon black. _ 5. The method for producing a microwave absorbing foamed material according to claim 1, wherein the added microwave absorbing material may be a carbon nanotube, a sheet-like iron oxide or a sheet-like oxide. - 6·—A kind of microwave absorbing foaming material finished with polyolefin plastic as the main basic material, mixed with foaming agent, microwave absorbing material and other additives. After continuous extrusion molding, electron beam irradiation is applied to the bridge. After the continuous pressure heating foaming process, the finished product of the microwave absorbing foaming material having the surface layer and the inner layer is produced, and the inner layer of the finished foaming material is gas generated by the electron beam irradiation bridging and foaming process of the foaming agent. While 14 1295625 pull the molten plastic to the ancient && hole. The universal father extends the extension to form a finished product having a plurality of sealed foams, such as the reduced absorption foaming material described in the application (4), wherein the electron beam system of the Heizhi bridge is output by the electron accelerator system. 8. The finished microwave absorbing foam material according to Item 6 or 7, wherein the electron beam can be lightly closed and the bridge density is adjusted. 9. The finished microwave absorbing foam material according to claim 6, wherein the added microwave absorbing material may be a conductive carbon black. 10. The finished microwave absorbing foam material according to claim 6, wherein the added microwave absorbing material may be a carbon nanotube, a flaky iron oxide or a flake alumina. 15